Time for more WebMs. Please feel free to contribute if you have any, or to offer suggestions on how I can make mine better.
Also, if you'd like to try making some of your own using ffmpeg, and you have questions about the process, please don't be afraid to ask.
More Info:
wiki.installgentoo.com/index.php?title=WebMtrac.ffmpeg.org/wiki/Encode/VP8